@@ -239,6 +239,49 @@ int virtio_find_vqs_ctx(struct virtio_device *vdev, unsigned nvqs,
desc);
}
+/**
+ * virtio_reset_vq - reset a queue individually
+ * @vdev: the device
+ * @queue_index: the queue index
+ * @callback: callback to free unused bufs
+ * @data: pass to callback
+ *
+ * returns 0 on success or error status
+ *
+ */
+static inline
+int virtio_reset_vq(struct virtio_device *vdev, u16 queue_index,
+ vq_reset_callback_t *callback, void *data)
+{
+ if (!vdev->config->reset_vq)
+ return -ENOENT;
+
+ return vdev->config->reset_vq(vdev, queue_index, callback, data);
+}
+
+/**
+ * virtio_enable_resetq - enable a reset queue
+ * @vdev: the device
+ * @queue_index: the queue index
+ * @callback: callback for the virtqueue, NULL for vq that do not need a callback
+ * @name: virtqueue names (mainly for debugging), NULL for vq unused by driver
+ * @ctx: ctx
+ *
+ * returns vq on success or error status
+ *
+ */
+static inline
+struct virtqueue *virtio_enable_resetq(struct virtio_device *vdev,
+ u16 queue_index, vq_callback_t *callback,
+ const char *name, const bool *ctx)
+{
+ if (!vdev->config->enable_reset_vq)
+ return ERR_PTR(-ENOENT);
+
+ return vdev->config->enable_reset_vq(vdev, queue_index, callback,
+ name, ctx);
+}
+
/**
* virtio_device_ready - enable vq use in probe function
* @vdev: the device
Add helper for virtio queue reset. * virtio_reset_vq: reset a queue individually * virtio_enable_resetq: enable a reset queue In the virtio_reset_vq(), these tasks will be completed: 1. notify the hardware queue to reset 2. recycle the buffer from vq 3. delete the vq Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com> --- include/linux/virtio_config.h | 43 +++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+)